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x^3 − x − 2x + 2 = 0
x(x − 1)(x + 1) − 2(x − 1) = 0
(x − 1)(x^2 + x − 2) = 0
(x − 1)(x − 1)(x + 2) = 0
(x − 1)^2(x + 2) = 0
x = 1 lub x = −2